The only way to fight the killers... is to become one herself.
Joy Kilbride works as a courier, providing a secure delivery service for MI5 and 6 in London. Her duties consist mainly of mind games, out-thinking hypothetical opponents who may not even exist. Her job is not supposed to be dangerous. But British intelligence is overstretched...
When her department are assigned a menial field task, Joy and her colleagues stumble across evidence of high-level treason, and a conspiracy to force America into a war with China. As the people she cares about are picked off one by one around her, Joy is labelled a traitor by her own superiors, and is forced to run.
Hunted by her own side, fanatical conspirators and a ruthless assassin with an agenda of his own, she is driven to greater and greater extremes in order to survive. In the end, the only way to save herself and thousands of innocent lives is to become as bad as her enemies.